I spent a good part of the day on Phoenix freeways shuttling my great aunt Eleanor to and from the emergency room at Good Samaritan Hospital. Sharp pain in the calf, with a swollen knee and the inability to step on her foot, indicated she might be having a blood clot. Fortunately, it was not that serious, but it turned out to be inflammation brought on by a previous injury from decades earlier being made worse by arthritis. Ice packs, rest, and ibuprofen were the prescription.